# -*- coding: utf-8 -*-

"""剑指 Offer II 041. 滑动窗口的平均值
给定一个整数数据流和一个窗口大小，根据该滑动窗口的大小，计算滑动窗口里所有数字的平均值。
实现 MovingAverage 类：
MovingAverage(int size) 用窗口大小 size 初始化对象。
double next(int val) 成员函数 next 每次调用的时候都会往滑动窗口增加一个整数，请计算并返回数据流中最后 size 个值的移动平均值，即滑动窗口里所有数字的平均值。

示例：
输入：
inputs = ["MovingAverage", "next", "next", "next", "next"]
inputs = [[3], [1], [10], [3], [5]]
输出：
[null, 1.0, 5.5, 4.66667, 6.0]
解释：
MovingAverage movingAverage = new MovingAverage(3);
movingAverage.next(1); // 返回 1.0 = 1 / 1
movingAverage.next(10); // 返回 5.5 = (1 + 10) / 2
movingAverage.next(3); // 返回 4.66667 = (1 + 10 + 3) / 3
movingAverage.next(5); // 返回 6.0 = (10 + 3 + 5) / 3

提示：
1 <= size <= 1000
-105 <= val <= 10^5
最多调用 next 方法 10^4 次"""

from queue import Queue

class MovingAverage:

    def __init__(self, size: int):
        """
        Initialize your data structure here.
        """
        self.queue = Queue(maxsize=size)
        self.total = 0
        self.count = 0

    def next(self, val: int) -> float:
        if self.queue.full():
            oldest = self.queue.get_nowait()
            self.total -= oldest
            self.queue.put_nowait(val)
            self.total += val
            average = self.total/self.count
        else:
            self.queue.put_nowait(val)
            self.total += val
            self.count += 1
            average = self.total/self.count
        return average


if __name__ == '__main__':
    movingAverage = MovingAverage(3)
    print(movingAverage.next(1))
    print(movingAverage.next(10))
    print(movingAverage.next(3))
    print(movingAverage.next(5))
